During the day, Lu Chen is a workhorse in the company who lets others take the blame, but at night he can enter other people's dreams in their dreams. He is a "dreamer" who judges evildoers in dreams, just to find his mother who has been missing for seven years.
Until he met An Ning in the fog of the dreamland - an illustrator who was regarded as a monster, who could use a paintbrush to draw light, doors, and silver circles in dreams that healed everything. She has been painting for six years, waiting for the back figure in the dream.
The two team up to break into the nightmare of a domestic abuser, the illusion of a pig slaughtering plate, and the memory of a human trafficker, and get closer to the truth about their mother's disappearance in dream trials. But every time he interferes with the dream, Lu Chen's body will become darker. The silver circle painted by An Ning is his only barrier against erosion.
The truth emerged: fragments of his mother's consciousness had been guarding him in the depths of the dream, and the doors in the dream were the only clues she left for him.
When the dream was about to collapse, Lu Chen finally understood - the back figure that An Ning had drawn for six years, the person he had been waiting for, was already by his side.
She was his only light in this long dark night.
